Wow, you do have quite a range of experience. I left teaching engineering and mathematics in academia to enter "the real world" of HW/SW design. Spent all my time designing cellular radio systems and handhelds, some satellite work on the Iridium project, then my own base station software company and finally consulting on intellectual property matters related to the same. I have three issued patents all in the mobile communications realm. Chances are that some of my work appears in all mobile phones today.
The doctrinal rigor with PCA churches is a mixed bag these days, to be sure. I have been considering moving to the OPC for that very reason. For now, it rests in the providence of the Lord.